import chai from 'chai';
import ByteBuffer from 'bytebuffer';

// Can't import type as StringUtils.Encoding
import { Encoding } from '../../../../session/utils/String';
import { StringUtils } from '../../../../session/utils';

// tslint:disable-next-line: no-require-imports no-var-requires
const chaiAsPromised = require('chai-as-promised');
chai.use(chaiAsPromised);

const { expect } = chai;

describe('String Utils', () => {
  describe('encode', () => {
    it('can encode to base64', async () => {
      const testString = 'AAAAAAAAAA';
      const encoded = StringUtils.encode(testString, 'base64');

      expect(encoded instanceof ArrayBuffer).to.equal(
        true,
        'a buffer was not returned from `encode`'
      );
      expect(encoded.byteLength).to.be.greaterThan(0);
    });

    it('can encode to hex', async () => {
      const testString = 'AAAAAAAAAA';
      const encoded = StringUtils.encode(testString, 'hex');

      expect(encoded instanceof ArrayBuffer).to.equal(
        true,
        'a buffer was not returned from `encode`'
      );
      expect(encoded.byteLength).to.be.greaterThan(0);
    });

    it('wont encode invalid hex', async () => {
      const testString = 'ZZZZZZZZZZ';
      const encoded = StringUtils.encode(testString, 'hex');

      expect(encoded.byteLength).to.equal(0);
    });

    it('can encode to binary', async () => {
      const testString = 'AAAAAAAAAA';
      const encoded = StringUtils.encode(testString, 'binary');

      expect(encoded instanceof ArrayBuffer).to.equal(
        true,
        'a buffer was not returned from `encode`'
      );
      expect(encoded.byteLength).to.be.greaterThan(0);
    });

    it('can encode to utf8', async () => {
      const testString = 'AAAAAAAAAA';
      const encoded = StringUtils.encode(testString, 'binary');

      expect(encoded instanceof ArrayBuffer).to.equal(
        true,
        'a buffer was not returned from `encode`'
      );
      expect(encoded.byteLength).to.be.greaterThan(0);
    });

    it('can encode empty string', async () => {
      const testString = '';
      expect(testString).to.have.length(0);

      const allEncodedings = (['base64', 'hex', 'binary', 'utf8'] as Array<
        Encoding
      >).map(e => StringUtils.encode(testString, e));

      allEncodedings.forEach(encoded => {
        expect(encoded instanceof ArrayBuffer).to.equal(
          true,
          'a buffer was not returned from `encode`'
        );
        expect(encoded.byteLength).to.equal(0);
      });
    });

    it('can encode huge string', async () => {
      const stringSize = Math.pow(2, 16);
      const testString = Array(stringSize)
        .fill('0')
        .join('');

      const allEncodedings = (['base64', 'hex', 'binary', 'utf8'] as Array<
        Encoding
      >).map(e => StringUtils.encode(testString, e));

      allEncodedings.forEach(encoded => {
        expect(encoded instanceof ArrayBuffer).to.equal(
          true,
          'a buffer was not returned from `encode`'
        );
        expect(encoded.byteLength).to.be.greaterThan(0);
      });
    });

    it("won't encode illegal string length in hex", async () => {
      const testString = 'A';
      const encode = () => StringUtils.encode(testString, 'hex');

      // Ensure string is odd length
      expect(testString.length % 2).to.equal(1);
      expect(encode).to.throw('Illegal str: Length not a multiple of 2');
    });

    it('can encode obscure string', async () => {
      const testString =
        '↓←¶ᶑᵶ⅑⏕→⅓‎ᵹ⅙ᵰᶎ⅔⅗↔‌ᶈ⅞⸜ᶊᵴᶉ↉¥ᶖᶋᶃᶓ⏦ᵾᶂᶆ↕⸝ᶔᶐ⏔£⏙⅐⅒ᶌ⁁ᶘᶄᶒᶸ⅘‏⅚⅛ᶙᶇᶕᶀ↑ᵿ⏠ᶍᵯ⏖⏗⅜ᶚᶏ⁊‍ᶁᶗᵽᵼ⅝⏘⅖⅕⏡';

      // Not valid hex format; try test the others
      const encodings = ['base64', 'binary', 'utf8'] as Array<Encoding>;

      encodings.forEach(encoding => {
        const encoded = StringUtils.encode(testString, encoding);
        expect(encoded instanceof ArrayBuffer).to.equal(
          true,
          `a buffer was not returned using encoding: '${encoding}'`
        );
        expect(encoded.byteLength).to.be.greaterThan(0);
      });
    });
  });

  describe('decode', () => {
    it('can decode empty buffer', async () => {
      const buffer = new ByteBuffer(0);

      const encodings = ['base64', 'hex', 'binary', 'utf8'] as Array<Encoding>;

      // Each encoding should be valid
      encodings.forEach(encoding => {
        const decoded = StringUtils.decode(buffer, encoding);

        expect(decoded).to.exist;
        expect(typeof decoded === String.name.toLowerCase());
        expect(decoded).to.have.length(0);
      });
    });

    it('can decode huge buffer', async () => {
      const bytes = Math.pow(2, 16);
      const bufferString = Array(bytes)
        .fill('A')
        .join('');
      const buffer = ByteBuffer.fromUTF8(bufferString);

      const encodings = ['base64', 'hex', 'binary', 'utf8'] as Array<Encoding>;

      // Each encoding should be valid
      encodings.forEach(encoding => {
        const decoded = StringUtils.decode(buffer, encoding);

        expect(decoded).to.exist;
        expect(typeof decoded === String.name.toLowerCase());
        expect(decoded).to.have.length.greaterThan(0);
      });
    });

    it('can decode from ByteBuffer', async () => {
      const buffer = ByteBuffer.fromUTF8('AAAAAAAAAA');

      const encodings = ['base64', 'hex', 'binary', 'utf8'] as Array<Encoding>;

      // Each encoding should be valid
      encodings.forEach(encoding => {
        const decoded = StringUtils.decode(buffer, encoding);

        expect(decoded).to.exist;
        expect(typeof decoded === String.name.toLowerCase());
        expect(decoded).to.have.length.greaterThan(0);
      });
    });

    it('can decode from Buffer', async () => {
      const arrayBuffer = new ArrayBuffer(10);
      const buffer = Buffer.from(arrayBuffer);
      buffer.writeUInt8(0, 0);

      const encodings = ['base64', 'hex', 'binary', 'utf8'] as Array<Encoding>;

      // Each encoding should be valid
      encodings.forEach(encoding => {
        const decoded = StringUtils.decode(buffer, encoding);

        expect(decoded).to.exist;
        expect(typeof decoded === String.name.toLowerCase());
        expect(decoded).to.have.length.greaterThan(0);
      });
    });

    it('can decode from ArrayBuffer', async () => {
      const buffer = new ArrayBuffer(10);

      const encodings = ['base64', 'hex', 'binary', 'utf8'] as Array<Encoding>;

      // Each encoding should be valid
      encodings.forEach(encoding => {
        const decoded = StringUtils.decode(buffer, encoding);

        expect(decoded).to.exist;
        expect(typeof decoded === String.name.toLowerCase());
        expect(decoded).to.have.length.greaterThan(0);
      });
    });

    it('can decode from Uint8Array', async () => {
      const buffer = new Uint8Array(10);

      const encodings = ['base64', 'hex', 'binary', 'utf8'] as Array<Encoding>;

      // Each encoding should be valid
      encodings.forEach(encoding => {
        const decoded = StringUtils.decode(buffer, encoding);

        expect(decoded).to.exist;
        expect(typeof decoded === String.name.toLowerCase());
        expect(decoded).to.have.length.greaterThan(0);
      });
    });
  });
});